<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .clearfix:after{
            display: block;
            content: "";
            clear: both;
        }
    </style>
</head>
<body>
    <div style="background-color: red" class="clearfix">
        <div style="float: left;">asdf</div>
        <div style="float: right;">asdf</div>
    </div>
    <div>中国</div>
</body>
</html>
